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Old 11-25-2013, 02:21 PM #1
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Default Excimer KrF krypton fluoride 248nm laser color?

Might be a dumb question but..... Is it just me? I can't see to find any reference to their color... I see it at work.. But i thought we could only see from about 390-700nm?



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Old 11-25-2013, 03:05 PM #2
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Default Re: Excimer KrF krypton fluoride 248nm laser color?

248nm would be ultraviolet and invisible to the human eye.
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Old 11-25-2013, 03:47 PM #3
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Default Re: Excimer KrF krypton fluoride 248nm laser color?

what you see might be some fluorescence effects (like the fluorescence of a 405nm BlueRay or N2 laser on a piece of white paper).
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Old 11-25-2013, 08:20 PM #4
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Default Re: Excimer KrF krypton fluoride 248nm laser color?

Visible range is about 400-800nm for most people, this will vary some from person to person but not a huge amount, 248nm is way beyond visible, as SerpenySlayer said that is well into UV.

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Old 11-26-2013, 12:32 AM #5
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Default Re: Excimer KrF krypton fluoride 248nm laser color?

Quote:
Originally Posted by SerpantSlayer View Post
248nm would be ultraviolet and invisible to the human eye.
Quote:
Originally Posted by Pi R Squared View Post
Visible range is about 400-800nm for most people, this will vary some from person to person but not a huge amount, 248nm is way beyond visible, as SerpenySlayer said that is well into UV.

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Which is why I was confused since I see a brilliant blue coming from it...

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Originally Posted by mojo_1234 View Post
what you see might be some fluorescence effects (like the fluorescence of a 405nm BlueRay or N2 laser on a piece of white paper).
the must be the answer... it sure is a beautiful brilliant blue...

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Old 11-27-2013, 04:40 PM #6
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Default Re: Excimer KrF krypton fluoride 248nm laser color?

Most of that will be light from the electrical discharge itself - waste light that is not part of the laser beam.
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Old 11-28-2013, 11:01 PM #7
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Default Re: Excimer KrF krypton fluoride 248nm laser color?

I've had hands on and "hands in" experience on a large KrF. At 248nm, lenses AR coated and mirrors AT coated for it still show 'some' fluorescence. The 800 mJ pulses ensures any imperfections on the optic, and any dopants in the optic break down or fluoresce with a deep violet color.

There's a lot of energy per photon in these beams, and when these photons strike materials, more interesting things are able to happen.

It is my understanding that visible blue light that lands on the optics is non-coherent discharge emission, and violet light on the optics is fluorescence.
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Old 12-12-2013, 07:33 AM #8
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Default Re: Excimer KrF krypton fluoride 248nm laser color?

Quote:
Originally Posted by Meatball View Post
I've had hands on and "hands in" experience on a large KrF. At 248nm, lenses AR coated and mirrors AT coated for it still show 'some' fluorescence. The 800 mJ pulses ensures any imperfections on the optic, and any dopants in the optic break down or fluoresce with a deep violet color.

There's a lot of energy per photon in these beams, and when these photons strike materials, more interesting things are able to happen.

It is my understanding that visible blue light that lands on the optics is non-coherent discharge emission, and violet light on the optics is fluorescence.
ah I see, and yes that sounds a little more my language. Fascinating machines.
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